#define _CRT_SECURE_NO_WARNINGS  1
#include<stdio.h>
int main()
{
	char s[] = "\\123456\123456\t";
	printf("%d\n", strlen(s));
	return 0;
}

#include <stdio.h>
#define N 2
#define M N + 1
#define NUM (M + 1) * M / 2
int main()
{
	printf("%d\n", NUM);
	return 0;
}

int b;
(1)const int* a = &b;
(2)int const* a = &b;
(3)int* const a = &b;
1 ^ 3 = 1
2 ^ 3 = 3 + 5
3 ^ 3 = 7 + 9 + 11
4 ^ 3 = 13 + 15 + 17 + 19

